Network Working Group S. De Cnodder
Internet-Draft Alcatel
Expires: May 25, 2005 N. Jonnala
Future Soft
M. Chiba
Cisco Systems, Inc.
November 24, 2004
RADIUS Dynamic Authorization Server MIB
draft-decnodder-radext-dynauth-server-mib-02.txt
Status of this Memo
This document is an Internet-Draft and is subject to all provisions
of section 3 of RFC 3667. By submitting this Internet-Draft, each
author represents that any applicable patent or other IPR claims of
which he or she is aware have been or will be disclosed, and any of
which he or she become aware will be disclosed, in accordance with
RFC 3668.
Internet-Drafts are working documents of the Internet Engineering
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This Internet-Draft will expire on May 25, 2005.
Copyright Notice
Copyright (C) The Internet Society (2004).
Abstract
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
In particular, it describes the RADIUS dynamic authorization server
(DAS) functions that support the dynamic authorization extensions as
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defined in RFC 3576.
Table of Contents
1. Requirements notation . . . . . . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. The Internet-Standard Management Framework . . . . . . . . . . 5
4. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 6
5. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
6. RADIUS Dynamic Authorization Server MIB Definitions . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 17
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 19
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.1 Normative References . . . . . . . . . . . . . . . . . . . . 20
9.2 Informative References . . . . . . . . . . . . . . . . . . . 20
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . 21
Intellectual Property and Copyright Statements . . . . . . . . 22
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1. Requirements notation
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119].
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2. Introduction
This memo defines a portion of the Management Information Base (MIB)
for use with network management protocols in the Internet community.
It is becoming increasingly important to support Dynamic
Authorization extensions on the NAS devices to handle the Disconnect
and CoA messages as described in [RFC3576] . As a result, the
effective management of RADIUS Dynamic Authorization entities is of
considerable importance. It complements the managed objects used for
managing RADIUS authentication and accounting clients as described in
[RFC2618] and [RFC2620], respectively.
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3. The Internet-Standard Management Framework
For a detailed overview of the documents that describe the current
Internet-Standard Management Framework, please refer to section 7 of
[RFC3410].
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. MIB objects are generally
accessed through the Simple Network Management Protocol (SNMP).
Objects in the MIB are defined using the mechanisms defined in the
Structure of Management Information (SMI). This memo specifies a MIB
module that is compliant to the SMIv2, which is described in STD 58,
RFC2578 [RFC2578], STD 58, RFC2579 [RFC2579] and STD 58, RFC2580
[RFC2580].
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4. Terminology
Dynamic Authorization Server (DAS)
The component that resides on the NAS which processes the Disconnect
and CoA requests sent by the Dynamic Authorization Client as
described in [RFC3576].
Dynamic Authorization Client (DAC)
The component which sends the Disconnect and CoA requests to the
Dynamic Authorization Server as described in [RFC3576].
Dynamic Authorization Server Port
The UDP port on which the Dynamic Authorization server listens for
the Disconnect and CoA requests sent by the Dynamic Authorization
Client.
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5. Overview
The RADIUS dynamic authorization extensions defined in [RFC3576],
distinguishes between the client function and the server function.
In RADIUS dynamic authorization, clients send Disconnect-Requests and
CoA-Requests, and servers reply with Disconnect-Acks, CoA-Acks, and
CoA-NAKs. Typically NAS devices implement the DAS function, and thus
would be expected to implement the RADIUS dynamic authorization
server MIB, while DACs implement the client function, and thus would
be expected to implement the RADIUS dynamic authorization client MIB.
However, it is possible for a RADIUS dynamic authorization entity to
perform both client and server functions. For example, a RADIUS
proxy may act as a DAS to one or more DACs, while simultaneously
acting as a DAC to one or more DASs. In such situations, it is
expected that RADIUS entities combining client and server
functionality will support both the client and server MIBs.
This memo describes the MIB for dynamic authorization servers and
relates to the following document as follows:
[RFC2618] describes the MIB for a RADIUS authentication client.
[RFC2619] describes the MIB for a RADIUS authentication server.
[RFC2620] describes the MIB for a RADIUS accounting client.
[RFC2621] describes the MIB for a RADIUS accounting server.
[DYNCLNT] describes the MIB for a RADIUS dynamic authorization
client.
+---------------+ +---------------+
User 1----| | Disconnect-Request | |
| Dynamic | CoA-Request | Dynamic |
user 2----| Authorization |<---------------------| Authorization |
| Server |--------------------->| Client |
User 3----| (DAS) | Disconnect-Ack | (DAC) |
| | Disconnect-NAK | |
+---------------+ CoA-Ack/CoA-NAK +---------------+
Figure 1: Mapping of clients and servers.
This MIB module for the dynamic authorization server contains the
following:
1. Two scalar objects
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2. One Dynamic Authorization Client Table. This table contains one
row for each DAC that the DAS shares a secret with.
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6. RADIUS Dynamic Authorization Server MIB Definitions
RADIUS-DYNAUTH-SERVER-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, OBJECT-IDENTITY,
Counter32, Integer32, mib-2 FROM SNMPv2-SMI
SnmpAdminString FROM SNMP-FRAMEWORK-MIB
InetAddressType, InetAddress FROM INET-ADDRESS-MIB
MODULE-COMPLIANCE, OBJECT-GROUP FROM SNMPv2-CONF;
radiusDynAuthServerMIB MODULE-IDENTITY
LAST-UPDATED "200404260000Z" -- 26 April 2004
ORGANIZATION "IETF RADEXT Working Group"
CONTACT-INFO
" Stefaan De Cnodder
Alcatel
Francis Wellesplein 1
B-2018 Antwerp
Belgium
Phone: +32 3 240 85 15
EMail: stefaan.de_cnodder@alcatel.be
Nagi Reddy Jonnala
Future Soft
480 - 481, Anna Salai
Nandanam, Chennai
India
EMail: nagi_reddy.jonnala@alcatel.be
Murtaza Chiba
Cisco Systems, Inc.
170 West Tasman Dr.
San Jose CA, 95134
Phone: +1 408 525 7198
EMail: mchiba@cisco.com "
DESCRIPTION
"The MIB module for entities implementing the server
side of the Dynamic Authorization extensions Remote
Access Dialin User Service (RADIUS) protocol.
Copyright (C) The Internet Society (date). This version
of this MIB module is part of RFC yyyy; see the RFC
itself for full legal notices."
-- RFC Ed.: replace yyyy with actual RFC number & remove this note
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REVISION "200404260000Z" -- 26 April 2004
DESCRIPTION "Initial version as published in RFC XXXX"
::= { radiusDynamicAuthorization 1 }
radiusMIB OBJECT-IDENTITY
STATUS current
DESCRIPTION
"The OID assigned to RADIUS MIB work by the IANA."
::= { mib-2 67 }
-- Ed. Note: The next available OID 3 is picked for
-- radiusDynamicAuthorization.
radiusDynamicAuthorization OBJECT IDENTIFIER ::= { radiusMIB 3 }
radiusDynAuthServerMIBObjects OBJECT IDENTIFIER ::=
{ radiusDynAuthServerMIB 1 }
radiusDynAuthServer OBJECT IDENTIFIER ::=
{ radiusDynAuthServerMIBObjects 1 }
radiusDynAuthServerInvalidClientAddresses OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS dynamic authorization messages
(both Disconnect and CoA) received from unknown
addresses."
::= { radiusDynAuthServer 1 }
radiusDynAuthServerIdentifier OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The NAS-Identifier of the RADIUS dynamic authorization
server."
::= { radiusDynAuthServer 2 }
radiusDynAuthClientTable OBJECT-TYPE
SYNTAX SEQUENCE OF RadiusDynAuthClientEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The (conceptual) table listing the RADIUS dynamic
authorization clients with which the server shares a
secret."
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::= { radiusDynAuthServer 3 }
radiusDynAuthClientEntry OBJECT-TYPE
SYNTAX RadiusDynAuthClientEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"An entry (conceptual row) representing the Dynamic
Authorization Client with which the server shares a
secret."
INDEX { radiusDynAuthClientIndex }
::= { radiusDynAuthClientTable 1 }
RadiusDynAuthClientEntry ::= SEQUENCE {
radiusDynAuthClientIndex Integer32,
radiusDynAuthClientAddressType InetAddressType,
radiusDynAuthClientAddress InetAddress,
radiusDynAuthServDisconRequests Counter32,
radiusDynAuthServDupDisconRequests Counter32,
radiusDynAuthServDisconAcks Counter32,
radiusDynAuthServDisconNaks Counter32,
radiusDynAuthServDisconUserSessRemoved Counter32,
radiusDynAuthServMalformedDisconRequests Counter32,
radiusDynAuthServDisconBadAuthenticators Counter32,
radiusDynAuthServDisconPacketsDropped Counter32,
radiusDynAuthServCoARequests Counter32,
radiusDynAuthServDupCoARequests Counter32,
radiusDynAuthServCoAAcks Counter32,
radiusDynAuthServCoANaks Counter32,
radiusDynAuthServCoAUserSessChanged Counter32,
radiusDynAuthServMalformedCoARequests Counter32,
radiusDynAuthServCoABadAuthenticators Counter32,
radiusDynAuthServCoAPacketsDropped Counter32,
radiusDynAuthServUnknownTypes Counter32
}
radiusDynAuthClientIndex OBJECT-TYPE
SYNTAX Integer32 (1..2147483647)
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"A number uniquely identifying each RADIUS
dynamic authorization client with which this Dynamic
Authorization Server communicates."
::= { radiusDynAuthClientEntry 1 }
radiusDynAuthClientAddressType OBJECT-TYPE
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SYNTAX InetAddressType
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The type of IP-Address of the RADIUS Dynamic
Authorization Client referred to in this table entry."
::= { radiusDynAuthClientEntry 2 }
radiusDynAuthClientAddress OBJECT-TYPE
SYNTAX InetAddress
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The IP-Address value of the RADIUS Dynamic
Authorization Client referred to in this table entry."
::= { radiusDynAuthClientEntry 3 }
radiusDynAuthServDisconRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Disconnect-Requests received
from this Dynamic Authorization Client."
::= { radiusDynAuthClientEntry 4 }
radiusDynAuthServDupDisconRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of duplicate RADIUS Disconnect-Request
packets received from this Dynamic Authorization
Client."
::= { radiusDynAuthClientEntry 5 }
radiusDynAuthServDisconAcks OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Disconnect-ACK packets
sent to this Dynamic Authorization Client"
::= { radiusDynAuthClientEntry 6 }
radiusDynAuthServDisconNaks OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
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STATUS current
DESCRIPTION
"The number of RADIUS Disconnect-NAK packets
sent to this Dynamic Authorization Client."
::= { radiusDynAuthClientEntry 7 }
radiusDynAuthServDisconUserSessRemoved OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of user sessions removed for the
Disconnect-Requests received from this
Dynamic Authorization Client. Depending on site
specific policies, a single Disconnect request
can remove multiple user sessions."
::= { radiusDynAuthClientEntry 8 }
radiusDynAuthServMalformedDisconRequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of malformed RADIUS Disconnect-Request
packets received from this Dynamic Authorization
client. Bad authenticators and unknown types are not
included as malformed Disconnect-Requests."
::= { radiusDynAuthClientEntry 9 }
radiusDynAuthServDisconBadAuthenticators OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS Disconnect-Request packets
which contained invalid Signature attributes
received from this Dynamic Authorization Client."
::= { radiusDynAuthClientEntry 10 }
radiusDynAuthServDisconPacketsDropped OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of incoming Disconnect-Requests
from this Dynamic Authorization Client silently
discarded for some reason other than malformed,
bad authenticators or unknown types."
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::= { radiusDynAuthClientEntry 11 }
radiusDynAuthServCoARequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of CoA requests received from this
Dynamic Authorization Client."
::= { radiusDynAuthClientEntry 12 }
radiusDynAuthServDupCoARequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of duplicate RADIUS CoA-Request
packets received from this Dynamic Authorization
client."
::= { radiusDynAuthClientEntry 13 }
radiusDynAuthServCoAAcks OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS CoA-ACK packets
sent to this Dynamic Authorization Client."
::= { radiusDynAuthClientEntry 14 }
radiusDynAuthServCoANaks OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS CoA-NAK packets
sent to this Dynamic Authorization Client."
::= { radiusDynAuthClientEntry 15 }
radiusDynAuthServCoAUserSessChanged OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of user sessions authorization
changed for the CoA-Requests received from this
Dynamic Authorization Cient. Depending on site
specific policies, a single CoA request can change
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multiple user sessions authorization"
::= { radiusDynAuthClientEntry 16 }
radiusDynAuthServMalformedCoARequests OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of malformed RADIUS CoA-Request
packets received from this Dynamic Authorization
Client. Bad authenticators and unknown types are not
included as malformed CoA-Requests."
::= { radiusDynAuthClientEntry 17 }
radiusDynAuthServCoABadAuthenticators OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of RADIUS CoA-Request packets which
contained invalid Signature attributes received
from this Dynamic Authorization client."
::= { radiusDynAuthClientEntry 18 }
radiusDynAuthServCoAPacketsDropped OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of incoming CoA packets from this
Dynamic Authorization Client silently discarded
for some reason other than malformed, bad
authenticators or unknown types."
::= { radiusDynAuthClientEntry 19 }
radiusDynAuthServUnknownTypes OBJECT-TYPE
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The number of incoming packets of unknown types
which were received on the Dynamic Authorization port."
::= { radiusDynAuthClientEntry 20 }
-- conformance information
radiusDynAuthServerMIBConformance
OBJECT IDENTIFIER ::= { radiusDynAuthServerMIB 2 }
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radiusDynAuthServerMIBCompliances
OBJECT IDENTIFIER ::= { radiusDynAuthServerMIBConformance 1 }
radiusDynAuthServerMIBGroups
OBJECT IDENTIFIER ::= { radiusDynAuthServerMIBConformance 2 }
-- compliance statements
radiusAuthServerMIBCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for entities implementing
the RADIUS Dynamic Authorization Server."
MODULE -- this module
MANDATORY-GROUPS { radiusDynAuthServerMIBGroup }
::= { radiusDynAuthServerMIBCompliances 1 }
-- units of conformance
radiusDynAuthServerMIBGroup OBJECT-GROUP
OBJECTS { radiusDynAuthServerInvalidClientAddresses,
radiusDynAuthServerIdentifier,
radiusDynAuthClientAddressType,
radiusDynAuthClientAddress,
radiusDynAuthServDisconRequests,
radiusDynAuthServDupDisconRequests,
radiusDynAuthServDisconAcks,
radiusDynAuthServDisconNaks,
radiusDynAuthServDisconUserSessRemoved,
radiusDynAuthServMalformedDisconRequests,
radiusDynAuthServDisconBadAuthenticators,
radiusDynAuthServDisconPacketsDropped,
radiusDynAuthServCoARequests,
radiusDynAuthServDupCoARequests,
radiusDynAuthServCoAAcks,
radiusDynAuthServCoANaks,
radiusDynAuthServCoAUserSessChanged,
radiusDynAuthServMalformedCoARequests,
radiusDynAuthServCoABadAuthenticators,
radiusDynAuthServCoAPacketsDropped,
radiusDynAuthServUnknownTypes
}
STATUS current
DESCRIPTION
"The collection of objects providing management of
a RADIUS Dynamic Authorization Server."
::= { radiusDynAuthServerMIBGroups 1 }
END
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7. Security Considerations
There are no management objects defined in this MIB module that have
a MAX-ACCESS clause of read-write and/or read-create. So, if this
MIB module is implemented correctly, then there is no risk that an
intruder can alter or create any management objects of this MIB
module via direct SNMP SET operations
Some of the readable objects in this MIB module (i.e., objects with a
MAX-ACCESS other than not-accessible) may be considered sensitive or
vulnerable in some network environments. It is thus important to
control even GET and/or NOTIFY access to these objects and possibly
to even encrypt the values of these objects when sending them over
the network via SNMP. These are the tables and objects and their
sensitivity/vulnerability:
radiusDynAuthClientAddress and radiusDynAuthClientAddressType
This can be used to determine the address of the DAC with which the
DAS is communicating. This information could be useful in mounting
an attack on the DAC.
radiusDynAuthServerIdentifier
This can be used to determine the Identifier of the DAS. This
information could be useful in impersonating the DAS.
The other readable objects are not really considered as being
sensitive or vulnerable. These objects are:
radiusDynAuthServerInvalidClientAddresses,
radiusDynAuthServDisconRequests,
radiusDynAuthServDupDisconRequests,
radiusDynAuthServDisconAcks,
radiusDynAuthServDisconNaks,
radiusDynAuthServDisconUserSessRemoved,
radiusDynAuthServMalformedDisconRequests,
radiusDynAuthServDisconBadAuthenticators,
radiusDynAuthServDisconPacketsDropped,
radiusDynAuthServCoARequests,
radiusDynAuthServDupCoARequests,
radiusDynAuthServCoAAcks,
radiusDynAuthServCoANaks,
radiusDynAuthServCoAUserSessChanged,
radiusDynAuthServMalformedCoARequests,
radiusDynAuthServCoABadAuthenticators,
radiusDynAuthServCoAPacketsDropped, and
radiusDynAuthServUnknownTypes.
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SNMP versions prior to SNMPv3 did not include adequate security.
Even if the network itself is secure (for example by using IPSec),
even then, there is no control as to who on the secure network is
allowed to access and GET/SET (read/change/create/delete) the objects
in this MIB module.
It is RECOMMENDED that implementers consider the security features as
provided by the SNMPv3 framework (see [RFC3410], section 8),
including full support for the SNMPv3 cryptographic mechanisms (for
authentication and privacy).
Further, deployment of SNMP versions prior to SNMPv3 is NOT
RECOMMENDED. Instead, it is RECOMMENDED to deploy SNMPv3 and to
enable cryptographic security. It is then a customer/operator
responsibility to ensure that the SNMP entity giving access to an
instance of this MIB module is properly configured to give access to
the objects only to those principals (users) that have legitimate
rights to indeed GET or SET (change/create/delete) them.
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8. Acknowledgements
This document reuses some of the work done in earlier RADIUS MIB
specifications [RFC2618] and [RFC2620].
The authors would also like to acknowledge the following people for
their contributions to this document: Anjaneyulu Pata.
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9. References
9.1 Normative References
[DYNCLNT] De Cnodder, S., Jonnala, N. and M. Chiba, "RADIUS Dynamic
Auhtorization Client MIB",
draft-decnodder-radext-dynauth-client-mib-01.txt, work in
progress, June 2004.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", RFC 2119, March 1997.
[RFC2578] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Structure of Management
Information Version 2 (SMIv2)", STD 58, RFC 2578, April
1999.
[RFC2579] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Textual Conventions for
SMIv2", STD 58, RFC 2579, April 1999.
[RFC2580] McCloghrie, K., Perkins, D., Schoenwaelder, J., Case, J.,
Rose, M. and S. Waldbusser, "Conformance Statements for
SMIv2", STD 58, RFC 2580, April 1999.
[RFC2618] Aboba, B. and G. Zorn, "RADIUS Authentication Client MIB",
RFC 2618, June 1999.
[RFC2619] Zorn, G. and B. Aboba, "RADIUS Authentication Server MIB",
RFC 2619, June 1999.
[RFC2620] Aboba, B. and G. Zorn, "RADIUS Accounting Client MIB", RFC
2620, June 1999.
[RFC2621] Zorn, G. and B. Aboba, "RADIUS Accounting Server MIB", RFC
2621, June 1999.
[RFC3576] Chiba, M., Dommety, G., Eklund, M., Mitton, D. and B.
Aboba, "Dynamic Authorization Extensions to Remote
Authentication Dial In User Service (RADIUS)", RFC 3576,
July 2003.
9.2 Informative References
[RFC3410] Case, J., Mundy, R., Partain, D. and B. Stewart,
"Introduction and Applicability Statements for Internet
Standard Management Framework", RFC 3410, December 2002.
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Authors' Addresses
Stefaan De Cnodder
Alcatel
Francis Wellesplein 1
B-2018 Antwerp
Belgium
Phone: +32 3 240 85 15
EMail: stefaan.de_cnodder@alcatel.be
Nagi Reddy Jonnala
Future Soft
480 - 481, Anna Salai
Nandanam, Chennai
India
EMail: nagi_reddy.jonnala@alcatel.be
Murtaza Chiba
Cisco Systems, Inc.
170 West Tasman Dr.
San Jose CA, 95134
Phone: +1 408 525 7198
EMail: mchiba@cisco.com
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De Cnodder, et al. Expires May 25, 2005 [Page 22]